Alarm for knobs.



E. J. FULLER.

ALARM FOR KNOBS.

APPLICATION FILED MAR.2,1915.

Patented Dec. 12, 1916.

In/vevvtm':

Tsgitnezlis:

.J I 45w i w UNITED STATES PATENT OFFICE.

EDWARD J. FULLER, OF NEW YORK. N. Y.

ALARM FOR KN OBS.

Application filed March 2, 1915.

To all whom it may concern Be it known that I, EDWARD J. FULLER, acitizen of the United States, and resident of the borough of Manhattan,in the city and State of New York, have invented a new and usefulImprovement in Alarms for Knobs, of which the following is aspecification.

This invention relates to an improvement in an alarm for knobs and hasfor its object to provide a device which is electrically opisrepresented in the accompanying drawings, in which- Figure 1 representsan end elevation of a portion of a door showing the knob located uponthe outside of the door in section, F1g.

- represents a transverse section through the outside knob taken in theplane of the line AA of Fig. 1, Fig. 3 represents a transverse sectionof the same taken in the plane of the line I3I3 of Fig. 1, and Fig. 4:represents a transverse section taken in the plane of the line CC ofFig. 1.

The door, denoted by 1, is provided with a lock 2 having a latch 3 and aspindle t passing through the lock, to which spindle the shank of a knob5 is secured by means of a screw 6, all of which is of well known and.approved construction.

The shank 7 of the hollow knob 8 is secured to the spindle 4: by a screw9. The free end of the shank 7 is provided with an exteriorly threadedportion 10 which has a free threaded engagement with a plate 11, whichplate is secured to an interior flange 12 of the knob 8 by means ofscrews 13. The plate 11 is provided with a slot 14: through whichprojects a pin 15 fixed in the shank 7. This pin and slot engagementadmits of a limited movement of the knob 8 and plate 11 upon the shank7.

To yieldingly hold the pin 15 in the center of the slot 14 so that themovement of the knob 8 will be the same if turned to the right or to theleft, I provide springs 16, 17, the inner ends of which engage the pin15 and the outer ends engage 18 in Specification of Letters Patent.

Patented Dec. 12, 1916.

Serial No. 11,530.

the plate 11 at points diametrically opposite the pin 15.

A contact piece 19 is adjustably fixed, to turn with the knob 8, upon astud 20 projecting inwardly within the knob and between nuts 21,22,which have a screw-threaded engagement with the stud 20.

A gravity operated contact piece 23 is mounted to freely swing upon thestud 20 in position to be engaged by the fixed contact piece 19.

In the alarm shown and described, an electric bell 2a is placed at anydesirable point and a battery 25 having a wire 26, leads therefrom tothe bell. A wire 27 passes from the bell through the lock 2, and channel28 cut in the shank S and is connected to the pin 15. A wire 29 passesfrom the battery through the lock and channel and is connected to thecontact piece 23 at 30. The contact piece 23 is insulated from the fixedcontact piece 19, as shown at 31 in Figs. 1 and 3. Thus it will be seenthat the alarm is placed in an open circuit, which is adapted to beclosed by the fixed contact piece 19 coming in contact with the loosecontact piece 23.

To throw the alarm out of use, a switch 32 is located in the wire 26between the bell and the battery.

In operation, supposing the parts to be in the position shown in Figs. 1and 3, the fixed contact piece being free of the loose contact piece 23:Upon turning the knob 8 either to the right or to the left, the fixedcontact piece will be brought into engagement with the loose contactpiece, as shown in dotted lines in Fig. 3, whereupon the circuit will beclosed and the alarm operated, which alarm will continue to operate aslong as the circuit is closed. When the knob is released, the spring 16or 17 will return it to its normal position, thus separating the contactpieces and breaking the circuit.

It will be understood that the fixed contact piece will be brought intoengagement with the loose contact piece before the end of the slot 14-has reached the pin 15, so that the spindle t and latch 3 will not bemoved until after the alarm has operated. After the end of the slot hasreached the pin, the further turning motion of the knob will be impartedto the pin and shank, and thence to the spindle which withdraws thelatch.

It is evident that various changes may be resorted to in the form,construction and arrangement of the several parts without departing fromthe spirit and scope of my invention; and hence I do not wish to limitmyself to the specific details set forth except as they be included inthe claims.

What I claim is 1. A shank, a hollow knob turnable thereon, an electricalarm having a fixed contact piece carried by the knob and a movablecontact piece mounted to swing freely within said knob in position to beengaged by the fixed contact piece, whereby the turning of said knob onthe shank will bring the contact pieces together to operate the alarm.

2. A shank, a hollow knob turnable thereon, an electric alarm having afixed contact piece carried by the knob and a movable contact piecemounted to swing freely within said knob in position to be engaged bythe fixed contact piece, whereby the turning of said knob on the shankwill bring the contact pieces together to operate the alarm, and meansfor automatically separating the contact pieces when the knob isreleased.

3. A shank, a hollow knob tnrnable thereon, an electric alarm having afixed contact piece carried by the knob and a movable contact piecemounted to swing freely within. said knob in position to be engaged bythe fixed contact piece, a lost motion connection between the shank andthe knob, whereby the turning of the knob will bring the contact piecestogether to operate the alarm, and means for automatically separatingthe contact pieces when the knob is released.

4. A shank, a hollow knob turnable thereon, said knob having a slottherein, a pin secured to said shank and projecting through said slotfor limiting the movement of the knob upon said shank. an electric alarmhaving a fixed contact piece carried by the knob and a movable contactpiece mounted to swing freely within said knob in position to beei'igaged by the fixed contact piece, whereby the turning of the knobwill bring the contact pieces together to operate the alarm, and meansbetween said pin and knob for automatically separating the contactpieces when the knob is released.

A shank, a hollow knob including a removable plate turnable on saidshank, said plate having a slot therein, a pin secured to said shank andprojecting through said slot for limiting the movement of the knob uponsaid shank, anelectric alarm having a fixed contact piece carried by theknob and a movable contact piece mounted to swing freely within saidknob in position to be engaged by the fixed contact piece, whereby theturning of the knob will bring the contact pieces together to operatethe alarm and a spring actuated means between said pin and knob forautomatically separating the contact pieces when the knob is released.

In testimony, that I claim the foregoing as my invention, I have signedmy name, in presence of two witnesses, this twenty-fifth day ofFebruary, 1915.

EDWARD J. FULLER. lVitnesses F. Gnonon BARRY, C. S. SUNDGREN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

